Remember at school when your mate would throw you a note, and even though you knew the teacher was looking right at you, you couldn't keep that giggle in?
Well, it turns out stifled laughter during serious moments isn't exclusive to your school years. In fact, even holding arguably some of the most powerful positions in the world doesn't make you adept at holding in the giggles.
Case in point, former President George W. Bush who couldn't help but crack a wise one in former President Barack Obama's ear whilst other former President Bill Clinton was giving a speech on the stage next other other former Presidents Jimmy Carter and George Bush Sr.
For the Hurricane Relief concert in Texas on Saturday, the five former Presidents joined forces with Lady Gaga and more raising nearly $33 million (£25m) for those affected my the recent hurricanes in the US.
And during this uplifting yet serious event, Bush junior took the opportunity to try and succeed in making the 44th President corpse.
Thankfully the internet was on hand to capture the moment Bush uttered his funny line, the moment Obama laughed and tried to make his face serious again.
We agree with this guy, we need to know what was so funny.
Hands up if you think it was a 'your mum' joke?
Mature guys, real mature.